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Question

Lets say for instance I only want to display posts that are assigned to BOTH categories 2 & 5.

I don't want to see posts that are only assigned to 2 OR 5.

Any way to do this?

or.. if its easier.. from both a specific category AND a specific tag

Answer 1

In a wp_query (I assume that's what you're wanting). You would use the following from the WP Class Reference for wp_query:

$query = new WP_Query( array( 'category__and' => array( 2, 5 ) ) );

For a category and a tag, I assume you could get away with (UNTESTED):

$args = array (
   'cat' => 2,
   'tag_id' => 5,
);
$query = new WP_Query($args);

You can view all wp_query arguments on the codex: https://codex.wordpress.org/Class_Reference/WP_Query